I wish this was better news, but after 2 years running Zimbra Enerprise with 75 users we are migrating to Exchange 2010. Up until recently I would considered us a success story.

Was this because Zimbra no longer met our needs? NO!
Was this because Zimbra did not work with our mobile devices? NO!

The reason was simply an internal management decision and based on a complete lack of any kind of support from VMware to provide a new quote to renew our license subscription.
I am at a complete loss of why a company such as VMware can not work with a customer to ensure they continue to operate successfully.

Since email is a vital part of our everyday operation, not having things work and the active-sync to our many mobile devices failing caused a great deal of concern.

I was not directly involved so I lack some of the details, however the major problem was simply that for the past 3 months we have been operating with temporary license keys after our purchased subscription expired. One month before this happened however we started to try and purchase a renewal of our subscription. When our subsciprtion actually experied, in despiration a new purchase was attempted through the on-line store but even that fell through the cracks and was never processed, to add to this the regional sales manger was on vaction and this was not addressed quickly. We even tried to go through a local VMware reseller and even they were unable to resolve the problem but they were at least helpfull in obtaining temporary keys to keep us going.

From everything I have been told regaridng thes events, I can not disagree with the management decision although I am very sad to see Zimbra go. I do like Zimbra as a solution and still feel it is a solid product.

Based on VMware's lack of assistance I can not defend them and must support the migration to Exchange now ...